Yep, SILVA is at version 138. You should be able to confirm this by looking through the provenance. However, I think the premade files are not the latest version, 138.1. If you'd like to use 138.1 then you can run through the RESCRIPt tutorial and construct the reference classifier yourself... though it'll take a while. If you are running qiime2-amplicon-2023.9, I'd suggest installing via this set of commands.
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